package org.example;

import org.example.pojo.User;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.concurrent.ConcurrentHashMap;

public class test { public static void main(String[] args) {
        User user = new User();
        Class<? extends User> aClass = user.getClass();
        System.out.println(aClass.getName());
    ArrayList<Integer> arrayList = new ArrayList<>();
    HashMap<Integer, Integer> hashMap = new HashMap<>();
    Hashtable<User, Integer> hashtable = new Hashtable<>();
    ConcurrentHashMap<Integer, Integer> concurrentHashMap = new ConcurrentHashMap<>();
    int n = Runtime.getRuntime().availableProcessors();
    System.out.println("cpu:"+n);

}
}
